Electromagnet for telegraphone purposes.



No. 873,078. PATENTED DEC. 10, 1907. P. 0. PEDBRSEN & V. POULSEN.

ELEOTROMAGNET FOR TELEGRAPHONE PURPOSES,

APPLIOATIION FILED APR.4, 19oz. RENEWED MAY z, 190?.

hL z neJJeJ; In 0022 571) am WM UNITED STATES PATENT OFFICE.

PEDER OLOF PEDERSEN AND VALDEMAR POULSEN, OF COPENHAGEN, DENMARK, ASSIGN ORS TO AMERICAN COLUMBIA.

TELEGRAPHONE COMPANY, A. CORPORATION OF THE DISTRICT OF ELECTBOMAGNET FOR TELEGBAPHONE PURPCSES.

'gade 2, Copenhagen, Denmark, have in- .vented certain new and useful, Improvements in Electroma Purposes, fication.

This invention is an improvement in telegraphones, and relates's ecificallyto the-location and position of t e poles of the electro-magnet with respect to the direction of e.ts for Telegraphone of which t e following is a speci- 4 movement of the steel body inwhich the record is made and from which'it is repro-' duced, whereby the magnetic impress ons tion made in the body will be as strong at the higher speeds as at the medium speeds of a magnetic body'of given area or size.

In the accompanying'drawing: Figure 1 is an explanatory diagram of the relative posio the. magnetic polesontwo steel bodies of difierent size or area; Fig, 2 shows the working Iposition of the magnet in accordance wit our invention, and Fig, '3 is an illustrative plan. f 1'. I

The form of the steel. body illustrated is that of awirej Fig. 'lshows two wires of exactly the same material but of different diameter. In the original Poulsen telegr aphone, the magnet-is referably bipolar, the two pole pieces thereo bein .adjustedto the wire at op osite points, so t at a line drawn between t em is cplerrp'endic 1lar to the length of the wire or its ection-of traverse, as, for

instance, shown at N58 on the larger wire a and at N, S on the small wire a. With the.

-magnet poles located in this manner on both bot wires and with both wires running at the same speed,it' be: seen that the distance between an' two sizccee' im ulses in a lo tudm direction will Specifioationof Letters Patent.

- nesses.

' et esamein w1res, whereas the distance between Patented Dec. 10, 1907.

101.345; Renewed Kay 21 1907 Serial No. 371L452.

the north and south poles of a single impulse in the large wire, is greater than 1t is in the small wire and that the ratio between these two distances become eater as the size of the wire is lessened. en this ratio, which increases with the speed, becomes very great, the demagnetizing force in the direction of the breadth of the We is very considerable and -the high speed therefore is no longer advanta eous. To avoid this we have located the 0 es of the magnet with respect to the steel ody so that a line passing through them will be oblique to the direction of movement, 1

as indicated by the lines NS and SN on thesmall wire of Fig. 1.

south poles of a given impulse without increasing the distance between the north and This arrangement; increases the distance between the north an'f south poles' of succeeding impulses. The, angle selected for the poles may vary considerably and should be made to correspond with the re uirements of the service. The

cides with the direction of motion, as shown in Fig. 3. The practical arrangement 'ofth magnet is shown in Fig.2, wherein it will be seen that the poles are in diflerent transverseline oblique to t e direction of motion of said body. I In testimony whereofwe have hereunto;

set our hands in the, presence .of two wit-z [PEDER OLOF PEDERSEN. VALDEMARPOULSEN Witnesses:.-

- Jess 1 HERMAN CHRIs'rE san',

'J;O.-JAooBsEN.-

maximum 0 inclination is that in which the joining line of the two magnet'poles coinoles applied thereto in a 

